就是说有AB两组人在饭店吃饭，每组10人.A组人吃饭前就决定大家一起share这顿饭钱（每个人都交最后总数的十分之一）。而B组人决定他们每个人各付各的Go Dutch，（老外吃饭都只交自己的那份，一般都自己吃自己的）。

，所以说最后的账单的总价钱B组的会比A组的多。

问是对，是错？

[此贴子已经被作者于2008-11-15 11:25:12编辑过]

错的

要求解释

Suppose in Group B, where the 10 students decide that each student will pay his/her own bill, everyone order a 10-dollar meal and thus you will pay 10 dollars.  Now, in Group A,if you order a 20-dollar meal, and suppose all others order the 10-dollar meal, then, you will pay 11 dollars to gain a 20-dollar meal.  That is to say, each individual in Group A has an incentive to order a higher valued meal relative to those in Group B.  Therefore, the total bill for Group A will be higher than that for Group B.

So, the answer for this question should be False.

Exactly!! Thank you very much! I got it now.

this is our professor's answer, most same as you.

(False.
The total bill of group A will be larger, since each student will consume food until the marginal benefit is equal to one-tenth of the marginal cost, rather than to the point where the marginal benefit is equal to the marginal cost.)